Sahih al-Bukhari 495
Sahih al-Bukhari · Book 8: Prayers (Salat) · The Sutra of the Imam is also a Sutra for those who are behind him
Narrated `Aun bin Abi Juhaifa:
حَدَّثَنَا أَبُو الْوَلِيدِ ، قَالَ حَدَّثَنَا شُعْبَةُ ، عَنْ عَوْنِ بْنِ أَبِي جُحَيْفَةَ ، قَالَ سَمِعْتُ أَبِي أَنَّ النَّبِيَّ صلى الله عليه وسلم صَلَّى بِهِمْ بِالْبَطْحَاءِ ـ وَبَيْنَ يَدَيْهِ عَنَزَةٌ ـ الظُّهْرَ رَكْعَتَيْنِ، وَالْعَصْرَ رَكْعَتَيْنِ، تَمُرُّ بَيْنَ يَدَيْهِ الْمَرْأَةُ وَالْحِمَارُ.
I heard my father saying, "The Prophet (ﷺ) led us, and prayed a two-rak`at Zuhr prayer and then a tworak` at `Asr prayer at Al-Batha' [??] with a short spear (planted) in front of him (as a Sutra) while women and donkeys were passing in front of him (beyond that stick).